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Loss Per Share - Schedule of Potentially Dilutive Securities Outstanding Excluded from Diluted Loss Per Share Calculation (Details) - shares shares in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Stock Options Outstanding |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Potentially dilutive securities outstanding excluded from diluted loss per share | 2,873 | 2,305
Non-vested Restricted Stock Awards |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Potentially dilutive securities outstanding excluded from diluted loss per share | 7 | 15
Non-vested Restricted Stock Units |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Potentially dilutive securities outstanding excluded from diluted loss per share | 38 |
Common Stock Warrants |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Potentially dilutive securities outstanding excluded from diluted loss per share | 105 |
Convertible Preferred Stock Warrants |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Potentially dilutive securities outstanding excluded from diluted loss per share |  | 85
Shares of Convertible Preferred Stock "as-converted" |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Potentially dilutive securities outstanding excluded from diluted loss per share |  | 10,994

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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